= S =
The FIFO input-character buffer in an RS-232 line
card. So called from DEC terminology used on DH and DZ line cards
for the VAX and PDP-11, presumably because it was a storage space
for fungible stuff that went in at the top and came out at the
--The Jargon File version 4.3.1, ed. ESR, autonoded by rescdsk.